flatten.js

'use strict';

const internals = {};


module.exports = internals.flatten = function (array, target) {

    const result = target || [];

    for (let i = 0; i < array.length; ++i) {
        if (Array.isArray(array[i])) {
            internals.flatten(array[i], result);
        }
        else {
            result.push(array[i]);
        }
    }

    return result;
};